Electric-fuse casing



Patented June 23, 1925.

UNITED STATES PATENT OFFICE.

HOMER r. CHANDLER, or MANSFIELD, 01110, ASSIGNOR TO THE OHIO BRASS com- PANY, OF MANSFIELD, OHIO, A CORPORATION OF NEW JERSEY.

ELECTRIC-FUSE CASING.

Application filed February 1, 1923. Serial No. 616,270.

To all whom it may concern.

Be it known that I, Home}: P. CHANDLER, a citizen of the United States of America, residing at Mansfield, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Electric-Fuse Casings, of which the following is a specification.

My invention relates to fused devices and has particular reference to the enclosed type of fuse.

The object of my invention is to produce an economic, efiicient fuse casing in which the fusible element is easily replaced in case of its being blown. Another object of my invention is to produce a fuse casing which is vented so as to permit the escape of gases formed when the fuse is blown.

My invention resides in the new and novel construction, combination and arrangement of the various elements hereinafter fully described and shown in the accompanying drawings.

In the accompanying drawing:

Fig. 1 is a side view in partial section.

Fig. 2 is a section taken on the line 2-2 of Fig. 1.

Fig. 3 is an end View with the end connector cap removed.

Fig. 4 is a view of one of the end connector caps shown in Fig. 1 rotated 90 degrees therefrom.

In the preferred form of my invention I employ a casing 1 formed preferably of insulating material. This casing is usually circular and forms a chamber in which the fusible element 2 is positioned.

' To each end of the casing 1 is secured a supporting terminal 3. The member 3 is shown as secured to the member 1 by a screw threaded attachment and is also shown as projecting beyond the ends of the casing 1 and externally threaded. The extreme outer face of the member 3 is corrugated or knurled or provided with serrations 4 forming a series of passages radiating across the end face thereof. The inner end of the member 3 is positioned against the shoulder 5 of the casing 1 which limits its inward movement. Threadably secured to each of the members 3 is a connector cap 6. The cap is provided with an end face 7 from which projects a tongue 8 by means of which the fuse is connected with the terminals of a fuse block as is well known in the course, if the end face 7 is always arranged so as not to butt against the end face of the member 3 the serrations 4 would not be necessary, neither the counter-bore 9. Secured to the inner surface of the member 3 and forming an integral part thereof a bridge wall 11 is provided having oppo silely disposed tapered sides. The bridge wall is arranged to secure the end of the fusible member 2 which is held to the bridge wall 11 by means of a screw 12. The face A of the bridge wall is angularly positioned, as shown, in preference to a bridge wall having-a transverse face at right angles to the inner face of the member 3 for the reason that it pern'iits less bending of the fuse at the point B, and at the same time provides a convenient angle for manipulating the screw 12.

T 00 sharp an angle at the point B in the fuse tends to weaken it, by changing the molecular characteristics of the metal and hence its fusible properties at this point, but by disposing the contacting face A of the bridge wall 11 as shown, the bend in the fuse at the point A. is considerably reduced which is undoubtedly a benefit to the reliability of the fuse.

The face C of the bridge wall 11 is angularly disposed for thereason that when the fuse blows it is not infrequent that a large portion of the fuse extending between the bridge wall at either end of the casing may drop into the interior of the casing and if the wall C is transversely disposed to the inner face of the member 3 it offers a re sistance to the easy removal of the old fuse Bil disclosed which will be apparent to one skilled in the art, therefore, I do not wish to be limited other than by my claims.

I claim:

l. A time casing comprising a tubular casing ot insulating material, a metallic bushing secured to the interior Wall of the casing at each end and projecting from the casing a metallic cap secured to the exterior projecting wall of each bushing, means on each cap to connect each cap to a terminal member, means on the bushing cooperating with means on the cap to provide a pa vge leading from the interior of the caeing to the exterior to allow the escape of gases formed therein, and means on the bushing, the base of the Wedge united e bushing and means on the outer face wedge members to secure the fusible emr-nt to each bushing.

i fuse casing comprising a tubular casa metallic hashing secured to the casmg at ea:- 1 end ot the canine. a metallic cap secured to each busl'iingz means on each cap to connect each cap to a terminal memher, means on the bushing cooperaliny with means on the cap to provide a means. leading trom the interior of the casing to the exterior to allow the escape of gases generated therein and means on the interior of each bushing;- to receive the end of a fusible element, the last said means con'iprising a wedge shaped member projecting inwardly from a portion ot the interior surface ol? the bushing, the base oi the wedge united to the bushing and means on the outer face to secure the fusible element to the bushing. 21A lusc casing comprisinga tubular casing of insulating materiah a metallic member secured to each end of the casing, means on each member to attach the memher to a terminal, and means projecting from each metallic member to receive an end of a fusible element the last said means comprising a wedge shaped member project lllf" 'l'rom the metallic member with the base ot the wedge united to the metallic member and means on one face of the projecting means to secure an end of the fusible ele ment thereto.

1-. A terminal member for a fuse casing cmnprising a member to be secured to the casing, an enclosinc member secured to the lirsl member and batting against an end face of the first member. an annular countcrbore in the tllt'll'ltllltl' member :uljarent the end face of the first member. radiating passages in the end face of the first member and leadillgj from .the interior of the first l'llBlIllJQl into the said counter-bore, the enclosing member being provided with an outlet lead go from the counter'oore to the exterior of the enclosing; member and means on the W member to ecurc the end of a fusible clement thereto.

a. A t'use casing; comprising an insulated "n e; a metallic terminal at each end, a

ca ch 1 element :l'or each terminal and means:-

forming an integral part of each terminal to receive the end of" a fusible link, said means ach having" an angular-h disposed taco torn. die the casin; opening to receive the end of the fusible link and an angularly disposed (face towards the interior ol the casing to facilitate the removal of the remains from a burnt fuse.

lntcstimony whereof I alfix my signature.

HOMER P. (QI IANDLIQR. 

